Linux / Unix: Cryptography Commands

Learn all about secure communication, data storage, commands that can be used to encrypt data and to create digital signatures under Max OS X, BSD, Linux, and Unix like operating systems (rss feed).

I recently read that SSH keys provide a secure way of logging into a Linux and Unix-based server. How do I set up SSH keys on a Linux or Unix based systems? In SSH for Linux/Unix, how do I set up public key authentication?

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I operate a small web site on Cloud server powered by CentOS Linux v6.4. I would like to encrypt my site’s information and create a more secure connection. How do I create a self-signed SSL certificate on Nginx for CentOS/Fedora or Red Hat Enterprise Linux based server?

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I know how to cange a passphrase for openssh using ssh-keygen command. How do I change a GPG encryption key’s passphrase on Linux or Unix like operating systems? How do I change the passphrase of the secret key using gpg?

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My cloud based backup service provider has ssh access to the backup system. How do I install and configure duplicity software for remote backups in incremental and encrypted format on Debian or Ubuntu Linux based desktop / laptop / server?

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Google Chrome/Chromium, Firefox and Opera browser support SPDY networking protocol. It enables faster browsing on supported sites. SPDY is similar to HTTP, with particular goals to reduce web page load latency and improve web security. SPDY achieves reduced latency through compression, multiplexing, and prioritization. How do I enable nginx SPDY support running on Debian or Ubuntu Linux server?

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I need to generate a md5 hash for given string. It will be used by shell script to generate keys for remote web service or cryptographic application. How do I generate a md5 hash based on any input string under Linux or Unix like operating systems?

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I‘ve recently swiched from Ubuntu Linux to CentOS / RHEL / Scientific Linux version 6 gnome desktop. However, I’m unable to find the gpass the password manager for GNOME2 desktop in repo. How do I install the same under RHEL 6 or CentOS or Scientific Linux 6 or Fedora Linux 15?

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